I have most of the answers, but for some of them I am confused. Help me out please.

4. find the geometric mean of 4 and 12. 24 8

Acarnival sold tickets for $1.50 for adults and $1.00 for students. there were 54 tickets sold for a total of $70.50. write a system of equations to represent the number of adult tickets,x, and the number of student tickets,y. find the solution and explain what it means. i'll you if you me

For the equations below which statement is true ?